5000 barrels of oil leaked from Keystone Pipeline in South Dakota

The conduit is not the controversial and long-delayed Keystone XL Pipeline which TransCanada is still shepherding through the approval process.

Officials don't believe the leak affected any surface water bodies or threatened any drinking water systems from the spill onto agricultural land, said Brian Walsh, an environmental scientist manager at the South Dakota Department of Environment and Natural Resources, which has dispatched a staff member to the site.

In April 2016, there was a 400-barrel release - or 16,800 gallons - with the majority of the oil cleanup completed in two months, Walsh said.

The pipeline has been shut off and the leak has been covered. The pipeline is shut off, and crews have started cleaning up the spill.

Reuters reporting contrinuted to this story.

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"TransCanada (TSX, NYSE: TRP) crews safely shut down its Keystone pipeline at approximately 6 a.m. CST (5 a.m. MST) after a drop in pressure was detected in its operating system resulting from an oil leak that is under investigation".

The company said the spill area was completely isolated within 15 minutes and emergency response procedures were activated.

In Canada, TransCanada reported21 incidents during the first year of operation, mainly small quantities of oil being spilled near pump stations and later cleaned up.

TransCanada says the safety of the public and environment are the company's top priorities. This northern leg has been closed, said the company, but the southern leg of the system from Cushing to the Gulf Coast remains operational.